Metrology is the science of measuring. It defines the principles and methods allowing to guarantee the confidence in measurements. To that aim, it develops and ensures that national reference standards are maintained, recognized internationally and allowing industry to reference their measuring instruments to the International System of Units (SI). (see: https://www.lne.fr/fr/comprendre/la-metrologie).

It is a transversal science that applies in all areas where quantitative measurements are carried out, relating to both fundamental issues and applications concerning everything that is measured. This is the reason why, even if we restrict ourselves to those for which electromagnetic waves play a role, we are dealing here with a multiplicity of subjects. This largely motivates the choice made for this URSI-France workshop 2025 (JS 25) of the following topics:

• Atomic clocks, time scales, optical and microwave time-frequency dissemination
• Quantum metrology and detection, fundamental electrical metrology
• Electromagnetic wave-based sensors (radio frequency, terahertz, optical)
• High frequency measurements, calibration tools and methods
• Antenna measurements: techniques, instruments, dynamics, resolution and uncertainties
• Electromagnetic dosimetry
• Electromagnetic localization, quantification of uncertainties
• Electromagnetic measurements of biological objects, diagnostics and bio-detection
• Electromagnetic characterization of materials, non-destructive measurements

The workshop will be structured around keynote and invited communications, and oral and poster sessions, with the aim of allowing a fruitful meeting between young scientists, experienced researchers and industry players, participants or exhibitors.

►The program will include an open session, allowing young scientists to present work on any subject relating to radioscience.

► Furthermore, the URSI policy of supporting the participation of women in radioscience strongly encourages them to make their work visible within the framework of JS 25 workshop.

See the call for communications - submission deadline: February 12, 2025

The workshop will take place from Tuesday June 10 to Thursday June 12 morning (2 ½ days) at the Cordeliers campus (15 rue de l'École de medicine 75006 Paris).

• A “Young researcher” grant of 300 euros and a free registration will be provided to the main author and presenter of the best article, if he is candidate, under 35 on March 26, 2024 and affiliated to a European laboratory other than French.
• A "Young scientist” best paper award will be selected by the scientific committee. The young scientist must be PhD student or post-doctoral student and first author of the paper.

These two allocations are independent and may turn out to be given to the same person.

The proceedings of the workshop will be available in open access on the URSI-France web site (https://www.ursi-france.org)

A selection of papers will be proposed for extended publication, in the Comptes rendus Physique de l’Académie des sciences (in English).

Organizing committee chair : Alain SIBILLE (Telecom Paris & URSI-France)

Scientific committee chair: Joseph Achkar (LNE-SYRTE, Observatoire de Paris)

Co-chairs : Tahsin Akalin (IEMN, U. Lille), Djamel Allal (LNE), Olivier Meyer (GEEPS, Sorbonne U.), Julien Sarrazin (GEEPS, Sorbonne U.), Yann Le Bihan (GEEPS, U. Paris-Saclay)

The registration fee is 290 € for each participant. It includes, among others, lunches and coffee breaks. A 145€ reduced fee will be applied to students and retired participants.

Registrations have to be made online: https://ursifr-2025.sciencesconf.org